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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8bf995026dbbb9dc14dd2aaaa421f85a8328d9a79d12cc7ebc8998bba6cbb552' 
  AND token = '4FP3F1SgXngldNVQWyzNaY81BdXmKcevZutokr0EtdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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