Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d62bf20cf95b3af4c35c88f1470a8fee9c1fcd69f145703ab606e0d82e2940' 
  AND token = 'lzEpgJTxOEmpJcwQAySguX1roe/dfnUfU/GuBRLNK78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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