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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '52af577374222d7feb8f8acdf1b74e9476dfb2977a60acb496a75eea6f77605f' 
  AND token = 'hcR1nbV7STHbUzkVNFyZVsQIJ5gVweYJObKRs5Qm06c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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