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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ae92b3ebf6b2b14da22d3d87f4f3f2e18cdf4c97fd9de2a162ff64180756888' 
  AND token = '9m2Z4MPINWGZH9G/MVkPrbQqTqHVLcsK165Yr20EV8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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