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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a828d4f014415939f5cbcce84e1fe18a126dee50042af5585834ace6ac2414b4' 
  AND token = 's5jvyr6WrU2/rsb5mo1uicrFcYJFqPNBJyIKcTpg4Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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