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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98e0bec7caa56cf36325228bee51dffb587f97ccdc5f60a2db1612f04c2a4d56' 
  AND token = 'KIkEQS9tbyEg1KSwPkm1iSMnojrtaobWcS1BUKUcoAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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