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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8c559eaa1bc089b53a36f23dd37d4eff9d24ffeaf6e784c935ebb5efa36f09dd' 
  AND token = 'GXNcLMUGF8nTUMA0V/hWRbDrKqwiezu3pZo/0UqECPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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