Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad750bb0b7cfa2e3b397806ed2394dbe3999994a93e231fd5ca48f13e8a7868' 
  AND token = 'k3M+TlMxwpHAPBOnEK2Lah33r1RXxJbMcNdNolE/P6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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