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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a8bf952e1ec00118c492279657faae6a055e91df67ebc9142ef5b82ebc921f4f' 
  AND token = '3Oh2NFQISzQrE9wkzF4MYiR+IJVWZ1wyn7FlAu1SIZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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