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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dda487e57961badbc49f601a981d5750f77f706761c5ea03465cb59c89cd0b6c' 
  AND token = 'pfZtbXTdwz+adCvYsI9pU9zzf4g9hVQe2J8oPuFipls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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