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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0db04bc9d8bd8e5fe608243922a654db84a6ab5b14f20a5063f45aaf3955e343' 
  AND token = 'BBeqlEnVTfXxxWJVYprCIf28Y/RBEKXAfi6BP0HTzVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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