Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976b8d3a6b70b511627b71c518daad1ab0f2f16d3cca47df6890cf6b3c20ec70' 
  AND token = 'f4kM7UTWhWbUVopjot8oPNPV5T16okNz3I/lvuaw2dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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