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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd96272ffe4a6f09d7cc7460bd97ed7992c62388649c1180911ead14cc78ddbd3' 
  AND token = '2CfJ2Qci+BPiDdyobaXU6IoRW2n28nlSD8lU0Xh7rd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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