Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07975702316b664acbd2753ae69c4d4ff508a6b1d3027687f1d3a5957cc2890' 
  AND token = 'WPka08zNhHj6kPfDOTdXyrlqT1Iz0reNxFAjmegpNdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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