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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2cebd5217a61d863e8d94fd8642369101a35676afa35543fdfe7e471849dbf97' 
  AND token = 'Xm/TMsZHQ7irwaY76emCS6tzM2DeAvb3zn7KeeMCTSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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