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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92a7888cc9f08fbbdd60939a309376bc426c2777a14afba1824c1e959a990927' 
  AND token = 'TH52iuz+Ne0fv8AOCf1xqURbi2Yr2/yNd7QKLt9fg6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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