Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ce85c808f5df38798b4614c05bc30546ce5d39c5ba6f9df1260b1702b396fe' 
  AND token = 'PKqD24U+297tnOyjf7CFiXbWF5s4WIG2qm55ujKYHsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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