Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6887e4663b18802aec66a4872187bf7d7ada5018672056aa68d9656773503a5' 
  AND token = 'gEuHGFyICHePi55kHTr/+2kisR4CDwrHSwRDDGaqL5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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