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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e867f1d8bdbd7c07f1e174f0e94ff33671fbb8013b3c79f048bebc888c28382' 
  AND token = 'uXvwnv8FwwttYMKa6x6XGb3ROsf6GBVaBNrWp93m2eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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