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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba594618e114d7e95d766eb6f5850777c821089a1470bab85badab214400de8c' 
  AND token = 'E24KwY3sr8RDwjH+6fi3p8RtCDPNw/ea0saKyR0qyZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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