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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1bdb6367433648c8152bf7ae6e78e71eb270df5043e92e9e3d5314aa36c5c21a' 
  AND token = 'ZtPYaBUln1LxVgieln/ZdS+1ayk9OrK8rxlMhFilUao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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