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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3c19b1d05427b72d8eacd07c215898e9346c52a82c5f2c473b7edb42ede50939' 
  AND token = 'Az5aadJwNLFxt8kqPr0B2kwjbAr/Ufg8kXAQam2JydI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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