SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '90f98db9813da745652ecbaf22dfc8ce2cf28ae8c76d4d49f169620cf63ee0ca' 
  AND token = '8WCxWHDSPkYu+0/WkUElJsVFzGq2oBunG7HMvlmiFGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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