Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887a1c314a8a78c9ec2b5c33eabdb8a7596251ee20fa1dc0c5e3fc0a91abae62' 
  AND token = 'MN+5+E5X+6Hgv9CKEolJqmr5kMXpv1GOf5RPB5mB/LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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