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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '59d96a898a68829d84ab4bfece2b46a2cb095856b061f4dd0bf9b7efd2d54ba2' 
  AND token = 'VuDrSrPt6rAph7X5Oq1t6xMwXeeHPU8pbpjEwM+K+ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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