Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42a8a5fd7f4c1a5df26e2fef9e60d6f157acbfd574ef3e4dc1481407cc94cfc' 
  AND token = 'wyNV80HDpyrio/ceEAzwXcANh6B8HFbDaqjxKyVQBK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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