Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912ea82d4a227be6fa68ddda247cc2e6fd4ff5f9aecbce14fadd18e2b2cef3ab' 
  AND token = 'KdwQwh1Ao5jl0fnihyzVpP3qHyjiqQ52jROlk38Yl6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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