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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8653dd20ef012b73461eae2cdea24c9bc6f57d96b777e1380a92997ccb96a2fa' 
  AND token = 'AUhwFyu/xW9lZ+MTNglHzF3WCsTfSmmL5nOERQBQUbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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