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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8c77b64392d0541c0dbfd8d6369810620e095049759cf849dfec08fc6ad4cdf0' 
  AND token = 'IlQ0zcQ9rcLIHCNCs10FedOCNXPok0rD8DPIIevGWZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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