Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173869994bcb8d80eb5472058f810077261ab7bb9838ac35ad883211de99d850' 
  AND token = 'bqqNiZcG+19hK5tPJ+71TS7ZezzwMehekdeLxA3fJdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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