Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5bf3a96033208a671bfd57964fa478fb0a6e6b58ff6c491c735731a245c290' 
  AND token = 'bBxK2PSWvkSbMhwkPVJ98tniGyUrxOdict2TWbXTchk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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