Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c4877a91b46eed814f1f3aaa72036b597b9f24b520af1ba2c20dbbed3c3d69' 
  AND token = '8P4niWThrlcbAWano1Yj+ajVV0A59kqRnEuduCbgKQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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