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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1baeaa65c03f514222a198233eea088750dc81ee87f04d88fec8acbf6748c55d' 
  AND token = 'ggRMmDtWjz5jwYgi+y1x/dS4lp5wMbPgR2BkgDCAAKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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