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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d5f45cd26ec5ddadf875594c3951b6a211625811af2410d594f1fb11445a3de' 
  AND token = 'D4U1KkhrmjBVm9MNo8+ZRHh85tWa+UXpbiGqKj12jvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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