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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a1a15045154b6cde3bb9267a2c22bdac4e2e29d6fac847406f50b46f1bd2c889' 
  AND token = 'im5W+w1K7JnjCMkrR73ThaoLF9nju1nOC1Osd1C3mfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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