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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b65b861ebdae896c3e2f0913b46ac8defc1b9068ec4fddabab845ec4f745a47c' 
  AND token = 'CQPp6nPSdpgdmkS2CEY9AyYp7PUghs1+YXNAZnbh/7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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