Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3ff2a7a4ddc1235ace13d57f43d3fb82ec20546098acf4c74056962c81cbda' 
  AND token = 'I3WWKGoph006ms9VXY3Xz2SH2d+IsTLLBCNQDBN0YdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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