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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a28e38a08b8295ef576102352844c6db3eabec6861ea15681afa4f0cb27a13e4' 
  AND token = 'ka1RXPGQtus5mBvPwTrJgm7qbRga2xPkqGivIqb5O/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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