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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aae63b99a21d290afe075d793071db5b3c771dce940483cf3f8c8a27e3a05613' 
  AND token = 'FXGnSwV5mckdT9EG28NGtkNrkP7geYENfJO7VJaSY1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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