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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c3cdd57217d11ad95edc1dcd4fcc0c1bc606eb31f0132886cf229f250a1c1762' 
  AND token = 'jlSKFUwNPmMf1vbXbu0aCdS3bxtnFgefFIMh0+F/wCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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