Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d14525b8eadffa2e4f6cd9e80da43c6371a3fd844612fb5a86cc1d616319a1' 
  AND token = '+NyaPxCPPqAYn48P+NT7TLEqPziUZ3At+3WwOg4/HM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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