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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '444d19f16007127b799ab3cdab48a3605808458ed6b9f8fea8aa8900fe284cb2' 
  AND token = 'uCrrdI910HYZJ0S6CUKqYhkXtoU5WzDry71OpGbOyNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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