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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9453e6983fee556cefbde7ea1e081f77888ac21450a6ae057532303b05d92b53' 
  AND token = '+vnJ9cE9zM/4mMIWpL0KCv/KLJDoC5fhTH47to7QY8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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