Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a09950a1d43427ac456689ed43e6efffaf6e9ce2c91d69c4e8a440b33c39baf' 
  AND token = 'b8LDQzdHKzML4sllPj+zq3GTbiX4P88q4oS1EOOXDV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}