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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f1299aa3e0b66d8e9b15c0bf6bf31d0c7e78180ab7358eaacba47e73539324e' 
  AND token = 'ju295uCbCPY4IJxP6/xq3OSCqJo3iSPLA5LqxGKthn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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