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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ef72b774cd2e7a0f749d4df06a74bd058eec5cb83cba96c71517bd7c57e4bab' 
  AND token = 'YEmHkIYkpeAWplhLudc0d6dQRaCatQjb1gB/g6vmbfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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