Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186ea1b14a9805a547606e9c5b74b313872a470285e96d4af4138cbf5d20aadb' 
  AND token = 'x/NJav6obfa4D0PRPjfdROtSoUjfDSL8H135ffjZbDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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