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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c9de196df77cdfba815696de6c2bd680c955207dd6085ea0cb43a4aa1293dfb' 
  AND token = 'X8nZIKpTaxGnxi3x3fPuPM+M8YE477fOQJ3L3n7pAlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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