Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627067222b9e8aa54124a62892289865aa1c97f7d4e51c5240e234bc34a6a9d9' 
  AND token = 'R4cn8UxOrxNyVWoCfVt/TpMlxXL8CjNd7/tLpOfDCMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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