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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f24aeac4c3ad2c02aed8275116fa991827ec70f6b7fed33be7f930397b3062d5' 
  AND token = 'eBsTNmutRgZiHyof31N7BzDE+5qeHOA3B1KnWJdaDYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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