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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '48ce8ad222146ad4b334bb22fe7e65ff8fd09ff8bb33c99b8d4658a3327c9a0e' 
  AND token = 'ZFEiCT2VZ8wutimJSYqAA2x0g86a+wbBAbIij3sXeoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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