Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc73d20034746c89b5eca7eed2c8a9f8c4ad3275d821849b7d295fa35be7915' 
  AND token = 'r0N9Ss6BTQYWaf8BfTzXHRUV32zIiTbwZlb4VrkC2XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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