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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ad5c7b7222318d4637630f337d0fe0edb494bed0e03650cf4856603938595cb' 
  AND token = 'CRwziX9a7a+LAd9PnjPmwwh+1TD6DX8QyAEOlOw6OJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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