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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '40ae494233ddaef61ea32965c176bcad200d3f39346d5c1f849a9f8a09491465' 
  AND token = 'G0Xy4iZGfOJTYhuGyl3NZSFOQ6UyMZrVnOH6fYsBqVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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