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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1ddaf5962925b3abbcfbe16c1766489638a117cdd4f6471e4a2daad18d0aae0' 
  AND token = '88JUf8f/SB3vdMgU5M44YUc2l/+pWj74lrYnsHW9MRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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