Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d628f20382aa50003df3a96e58c1270b4552f3edbc0a59740925d2270184b99' 
  AND token = 'R+1jm5nYF4jREUaZVtXcgVq2ZyPAm4sIoxamq+ovpTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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