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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12aa6baf3b06f96686200d3bd05220db1fb92db722be42b8b09ea1cb3cbe2539' 
  AND token = 'qgCnEAhxrLeoGV9aDqtwh+1k8pvmayndO9UNFeLI9LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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