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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '83f018f97431d8bfe56df1b4fbc3f54734fb92d3dc603cebbc1bec334794950a' 
  AND token = 'ivpQ4ea613ZRrMdLyxxp7boh9SR2CHS4kNR7qbq88hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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