Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c742e3e086c486b0f019452f5973c9fcb7e0502297b3fd676c10de708f01ff' 
  AND token = 'DevzK74m48Df7Mt1dVs4X3LtKL5o92CoSqdAS1aQK4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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