Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3663b30bc5e7fb12a5a1c9d5bc0ce11ee6d3da149eb4a34d3fc4a577ba3731b' 
  AND token = '2dRjLLIDVZI0XnTHWVUhBDMvNTfy1utCrWY+nCNl9xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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