Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408bfd2550ed375e20a880d9642e79d860cf5d6b13d4fa8f9af56985408811c3' 
  AND token = '1Bfjy6d6v1U2buEm8eSiuMyUUUpz5pUkNu0PEF6YTZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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