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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ca632ef3f644b31877c6d3c4fb7371a5a8eb2cbacb10cbe2886e3649c4caaec' 
  AND token = '46IFTN7DlQJewyWLqpFVmq8+d6ZCWbnggEMGX8JhHX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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