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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7aa066d4dcc3230f09939ffd257efed31556b75f8c255ef30e4e921c9bdc22cd' 
  AND token = 'B2FM0zp4epDSGnfb6n+XUWTPpLtqOI7pYcQT4UYTx68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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