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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9db0f1a01e25cfcebc61178a85bbdd7928e61823f4496ed95c152781dcf8353e' 
  AND token = 'cU1lwOW6O+PSaH+f9Bn1T3aN/PWOwSk/NB1owgygjTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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